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The Ute Ute no Mi is a non-canon Paramecia-type Devil Fruit that allows the user's to turn anything into a gun, making the user a Firing Human (発砲人間,Happō Ningen?). It was eaten by Bad One Gracie.
The fruit's main strength is turning anything in the user's hands into a gun. Any object such as a block of wood, a coffee mug, or a saber transforms into a firearm that, incidentally, shoots force beams rather than bullets.
This fruit, granting the ability to transform things into a type of weaponry, is similar to the Buki Buki no Mi (which allows one to transform into any form of man-made weaponry, not just firearms) and the Supa Supa no Mi (which allows one to transform body parts into the specific weapon type of blades).